[swift-users] Autoreleasepool for Ubuntu

[Jordan Rose]

I’m confused about this. Shouldn’t you be able to get away with using +1 convention everywhere? What needs to have arbitrary lifetime-extension in an ARC-ified language?

Jordan

> On Nov 2, 2016, at 12:23, Philippe Hausler <phausler at apple.com> wrote:
> 
> So there are issues we have in swift-corelibs that suffer(leak) because we don't have ARPs on Linux. It would be super nice to have a retain until scope end concept for swift core libs where autorelease would be an accessor in unmanaged that would retain the object until the arp ends scope.
> 
> Sent from my iPhone
> 
> On Nov 2, 2016, at 10:17 AM, Jordan Rose <jordan_rose at apple.com <mailto:jordan_rose at apple.com>> wrote:
> 
>> 
>>> On Nov 2, 2016, at 09:42, Joe Groff via swift-users <swift-users at swift.org <mailto:swift-users at swift.org>> wrote:
>>> 
>>>> 
>>>> On Nov 1, 2016, at 6:40 PM, Bernardo Breder via swift-users <swift-users at swift.org <mailto:swift-users at swift.org>> wrote:
>>>> 
>>>> Hello,
>>>> 
>>>> I want to create a mini http server project and execute at Ubuntu 15. The Xcode compile and access the function "autoreleasepool", but when i compile the same code at Ubuntu, this function not found
>>>> 
>>>> For example, i can compile the code above at Xcode:
>>>> 
>>>> while true {
>>>>    autoreleasepool {
>>>>    var test: Data = "HTTP/1.1 200 OK\r\nContent-Length: 1\r\n\r\na".data(using: .utf8)!
>>>>    }
>>>> }
>>>> 
>>>> But when i try to compile at Ubuntu:
>>>> 
>>>> git at breder:~$ cat main.swift     
>>>> import Foundation
>>>> 
>>>> while true {
>>>>    autoreleasepool {
>>>>    var test: Data = "HTTP/1.1 200 OK\r\nContent-Length: 1\r\n\r\na".data(using: .utf8)!
>>>>    }
>>>> }
>>>> 
>>>> git at breder:~$ swiftc main.swift 
>>>> main.swift:4:5: error: use of unresolved identifier 'autoreleasepool'
>>>>    autoreleasepool {
>>>>    ^~~~~~~~~~~~~~~
>>> 
>>> Autoreleasepools are an ObjC compatibility feature. They aren't necessary in standalone Swift.
>> 
>> But they are necessary in Swift programs on Apple platforms (that don’t use RunLoop, anyway). Philippe, what do you think? What’s the right way to write cross-platform code that doesn’t use RunLoop or dispatch_main for an implicit autorelease pool?
>> 
>> (/me remembers +[NSAutoreleasePool drain] from the ObjC-GC days)
>> 
>> Jordan

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